This paper was carried out to Investigate changes in the activities of cell-degrading enzymes, cell wall components and cell structure of peach during maturation and storage for valuation of quality. The firmness of peach was decreased during maturation and storage, and was remarkably decreased in Daegubo than Yumyung. Polygalacturonase and $eta$-galactosidase activities of peach were increased during maturation and storage, and were remarably increased in soft peach and in mature and soft peach, respectively. Contents of alcohol-insoluble substance, cell wall, and total and insoluble pectin of peach were decreased during maturation and storage, but cellulose and soluble pectin were increased. Intracellular space was enlarged during maturation and middle lamella was gradually degraded during maturation.